论文标题
IIP SN类型SN 2021yja周围的情节材料
The circumstellar material around the Type IIP SN 2021yja
论文作者
论文摘要
大多数II型蓝植物超新星（SNE IIP）的光曲线与真空中恒星的爆炸不兼容。取而代之的是，光曲线要求祖细胞嵌入偶然物质（CSM）中。我们报告了良好观察到的SN IIP 2021YJA的成功拟合，这是巨大恒星的核心折叠爆炸，初始质量为〜15 msun，预探索前半径为631 rsun。为了解释宽带光曲线的早期行为，需要在〜2x10^14 cm内的0.55 msun CSM的存在。像许多其他SNE IIP一样，SN 2021YJA表现出早期助焊剂的超级量，包括紫外线波长。这与GRI谱带中的短上升时间（<2天）一起表明CSM中存在紧凑的成分，本质上与祖细胞相邻。我们讨论了先前存在的CSM的起源，这很可能是对流红色超级巨大信封的共同特性。我们认为，将整个光曲线与一个球形分布拟合的困难表明SN 2021yja祖细胞周围的CSM是不对称的。
The majority of Type II-plateau supernovae (SNe IIP) have light curves that are not compatible with the explosions of stars in a vacuum; instead, the light curves require the progenitors to be embedded in circumstellar matter (CSM). We report on the successful fitting of the well-observed SN IIP 2021yja as a core-collapse explosion of a massive star with an initial mass of ~15 Msun and a pre-explosion radius of 631 Rsun. To explain the early-time behaviour of the broad-band light curves, the presence of 0.55 Msun CSM within ~2x10^14 cm is needed. Like many other SNe IIP, SN 2021yja exhibits an early-time flux excess including ultraviolet wavelengths. This, together with the short rise time (<2 days) in the gri bands, indicates the presence of a compact component in the CSM, essentially adjacent to the progenitor. We discuss the origin of the pre-existing CSM, which is most likely a common property of highly convective red supergiant envelopes. We argue that the difficulty in fitting the entire light curve with one spherical distribution indicates that the CSM around the SN 2021yja progenitor was asymmetric.
